Question: What is the 1099 filing address for Michigan?   Answer: Sign, date and mail your Form MI 165 (Annual Return for Sales, Use and Withholding Taxes) along with your 1099 returns to:   Michigan Department of Treasury Department 78172 P.O. Box 78000 Detroit, MI 48278-0172   For more information refer to http://1099-efile.realtaxtools.com/state/Michigan/